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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0b14fd1534f88fcc2acc403e56e8da344c74048eed6270ec9cf4d7911bb003' 
  AND token = 'ebk1xLtomeafXo7PU+b1C315ZDAFCCggXacsaqQGzPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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