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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8083320fd62f80a19a74ad86f66a228f9ff2e4b530e8675334b332361b8e440' 
  AND token = 'VDh9m9DnYW+f2ztE73XE/q0EszFpgOqSreawO0cIQq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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