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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76414a2758f8ef3e87a215b6ec559c76f9b32a5b21233a220653d0d7a319e50' 
  AND token = 'rZRwM2sfZ5v30709EbY9xzpFwDNlMM28Qnrw8p9armo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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