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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6503af66eae4679484dc1b2b040c91bbcc689ea4103959aaa3f4d965b899ce' 
  AND token = 'hQNH9J4WYMf/6xicJ5k6FUO6Pzx3C7V5gAnzftZVm0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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