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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28511c7e5ec0027d1aea02558f69aba713ab4751bc57649022aaccb0ce06b78c' 
  AND token = 'R7VEtazf7q+opbR/079wDAdVf06y57V+Kiu17Q4c1zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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