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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2905ab7d14cd3e301280a4f5537a6efc7a52d7912d09ded5bf08de57e42ca84' 
  AND token = 'EP9yob4uG/LE67AWo5VmqcR2eP8I18UDGA4ZXb96EkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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