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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1693969377eed5a8f258bc65949f88ad78dcd38370e1e52e72e12f74b0bff77' 
  AND token = '9/D8H7OGB5QsuuBe6tncAQF4WXxnGaWR8eQIFfKK3o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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