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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ddfa9c6e2c8c50ea597e231af05c89f5384cc257fbfe9f9cb38d5f5dbb69cc' 
  AND token = 'of0R+MCPbbIPr+ofLW7wyATWXHmL6iCzgiCYzU05BM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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