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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ef3d09c73907df27e929ef5533d6b98b3172b3b296c508f88f6f87c795cbfd' 
  AND token = 'UhIFzg0LWAUc28kTvVW3wdXND0HPg+lXOiMvoD2Tz5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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