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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79919d43b3ed2530457e1ba21a3f4d479ccbc095ef053bb867e1392915ce2414' 
  AND token = 'NN0gdXdwm4i13jpkQuNJTqztXQX9HHeCjCeZ8axm120=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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