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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9feb41f0ecdb92be9190f8834df576a84f0b5732c34fef5ef1dd6ad405dc34c' 
  AND token = 'BXhj8Dy5veY9xly8pDVx4Q4houSUI2O5Jb40KT0yiGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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