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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f06ad2681d2aed7a6c0ad536a545122399006d23c1be15e5d9ec5478c8c2ca' 
  AND token = 'WmRqg8zzgsQmfuGJ6M4BKKqQz751yN/eK8N6agCvF7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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