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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7523527c31c240ecd1b20874a7a12eba4b8d0efcf28724cd95ff4ff9b89feb' 
  AND token = 'EgAvLkiryOszbUZQB8Qx0NeuSN8OIP1gcR5qZrkcpDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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