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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73511e0744d5b517e506033a84e8eb571a2451f32c215d09be5ed4b92f3e8658' 
  AND token = 'iui8/+XBe1OfLfoaQfC2FomxUPQT2vLQls127NgUv7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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