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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38bbae7b1b4dc03fb67e9e25949876e552011623e87d72c54d96ee7169a483c' 
  AND token = 'eNke4sQm1m4zXDj08TZ4YgcxGSytmatxIXu1xkhgxkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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