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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32562809640f788481ec22b3ba94a9fbb96e61be252ad2be6f0074eb6294610f' 
  AND token = 'ScHx8VHGIk9dFWLhO+6MhJyvPpQSnG9FgLylrYJQHac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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