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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd18b3798555f465a363cee94b41bd7bc64d9dbcc43d1b8e18ff8a8fde567dd8' 
  AND token = 'xR1vLsKd/xlPNAnHjGtkhMX10aSU+rUU5hap5BNs+54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}