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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c148df65372da9b68cae0a40c1737c9382a42e31a28b47a64bcd0de117d3f7a' 
  AND token = 'vtrscCIa7UDba+7pzzquqPOroztTnq9JP7Zulr72ecI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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