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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e3f4c133102930458190345e0cd28e5eea2b0d63f0d23ee736b6e6c24ebf5e' 
  AND token = 'AI6R08Y/B9AC7K+xhWTQ5X+yaouYzI3gFgwEoofaqbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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