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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c8fd96248bc68ee04711e852ef5e628129a24d5e23e0babcbd3433cfe9d0f4' 
  AND token = '1XcRds3eBHhoXaUpdXiHjTSs1ycnBwF4QFM9nViLjQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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