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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85340f05ed3718dac2f4345af3a24599e8f94062e89ec64a99a3238487b0c98' 
  AND token = 'fI0dkDifGDQ8u9kjYFbxUGv43Bh/S3JLbahti7GmtKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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