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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c9d8dcb217783416456155541d736b5f39d6023b23699f68831948f2e4cd72' 
  AND token = 'xw2rlgeYAEeSSCOcCJvdWe86/W9tpahkHBF6sPDYF8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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