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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9802e94697d75d21dc73c14319a2366f94960f42a6d8fd8b1ed63ce4831ca3f8' 
  AND token = '5m83Ol8Di4phi0qlpT6+1PpP63QeUAK8EmrkU0CqBGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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