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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2108f1ca672f35acb3233e0c6bde70038d94ad783556ce2f538c7b8a505e62b7' 
  AND token = 'oPhpntBXVbHNwC8ukXxSt6QpdivQE04XC/3J/FN1icU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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