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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5c46b0b5aaadaed5ab333b006466ec9e284697ec6a802376f1ad8ac032ff67' 
  AND token = '8u82kt4N9ZCqTpSd6XB42cMdPwtJdCACKVjU/EuLfwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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