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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4ce87b792e6e1ebf155674fe4a4da3f645445f36957800ef94e4ed61a550d2' 
  AND token = 'rb3SJLfUm4yjoXIrxjYm7cOkrMDutquza6Y0vGP7nfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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