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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af94ee21158dada4a66a45724934af672fe7d316bdb7981d6a4d3dfa20d9dc65' 
  AND token = 'WO3sIsOXbgQLJMV9H/UIu/5flPaogNCx71V/6vwYXWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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