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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab503dacf6ea6d32e53d0623edd7b2c3756ff380486470b74ab1d479f8c1e96b' 
  AND token = 'ebJ53UXqS+YbR1cGsR5nwtduD6Ulj9MsXNkkMBq0Yf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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