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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8110508e3eaa5f32056c49489574fe0888ea44ed0da0cfce4011626e4cc8f6fb' 
  AND token = 'shjipC9eotsXKcjhz5TkrLJcFLNZgp3v/MOMi29qOz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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