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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6362e57cd3620c039f4d194ccd4f34be3b29b052694faf29d80e50158425eaaf' 
  AND token = 'YlKbYGTwzmjrO6+lqzfliD7cGfh14jrmOJ84Dq4X4HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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