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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6f05dfc3f716301630ed95f7c32899de272706b020dc20bf6a4a90591554f9' 
  AND token = 'ihPyq/6guFz5Y6PETBOWxda4EnIWKFtOITGz8ZYeIkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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