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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928e5eb77f6b438d057bad0d746f69567abfc6e19896b4a4a452eba697ba7c0f' 
  AND token = '4D8rMdkEuD9MwDCy2sWld2uvvOVchaKiXJwfRfTbPtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00183

JSON explain

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