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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b25f0871e3dad063b6bb838052ac5f4a968dc242954575481eabfcc4655fb98' 
  AND token = '7L1HacmVgXDuIvbo0gRAkPijR04d5Zz+UVyFCknrygA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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