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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f77e3d79bd538b8f12c77d62f037ef8ec6e0ac959417ec729041866530624c' 
  AND token = '2SKUdKFxqcz+jvgwA7pir7Refsz3drRu7l2CrYKocH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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