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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee333a55e6e5b18519ae40b6553a78e693bf3113e1bb4695657f2090166bacb' 
  AND token = 'N66W6N2qKfwq1+a0rcao8NSOkmZttKpv3L73+OIDIuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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