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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f3df714ed7e3d9211ca3d4ecb7bb6c8958e4c9fcb390752aaf0a703984beea' 
  AND token = 'aHLRRS4n9Gz7cZr5ICWn1ELgnn2QGiqlhwK+J58GGs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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