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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea742bdab41c510587ec7ee73eac8cfebfc74fcb15bd0725bb6ce8ae0bdbc76e' 
  AND token = 'FlJnZK9F7/XBmPn1TX7mfR6TMP3rKX1AFMZuTyfAbAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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