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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ccb761033c5ec0d395d64b6499cea55789a0400cf39683790cdee313b51592' 
  AND token = 'MUXO59NSatJo2RpWcV6kkF3oyAqjbGMKNy4PK5qbFio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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