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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fa42d9b12ce30b9736e71235da2a706fd89edbbcf71d2135c51ad942d9b1f9' 
  AND token = 'k9VoDtcbVts8qdQb558rwF649PQefyL5T0wSk2S/tu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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