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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caee7c8bb68c8da2ba8d43f2d0f81ef63f20e6e037f78c89d42bc1fdce11f3dd' 
  AND token = 'r9STsZC6tCyYZXTGuY/IRwLqupokQrMAu5ZJWX6n6Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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