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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc68b1b72899c2cde835f8fa479bb32fd3b03c6d563346643536e67da7707246' 
  AND token = 'vIlMiw958wBra4FKZ+oj2VwwFJcOF9v7bZYn3PMNcI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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