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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd855ab4ce11ba1788278083a530037e4e8e55c731033f31a58deedd74ed6daa5' 
  AND token = '8zwwtCpB9G0Wr+9OVo3wbcAZmB+btmF72n3h53PPY/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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