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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cc2720327d55b08fba2aa477ea74fbf900d0260c92af4ec8e3601414def6b2' 
  AND token = '7YHIJkW7zcRYQZWu0Iwo30rXtleKni+oHtdLPMYqIyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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