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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3658d8cf3d9999a0a95c28a8d0032a7a77942ddbcd5e53873b5d1f0020e514' 
  AND token = '9RNp3DMeAPEUOHHiifTHGJ5MNZEI1UxCi7ACV73EtAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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