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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76b033b75b2903e7c3905e5c07c21d0ced3c613616669efa8f5df33a547dbeb' 
  AND token = 'u2K3rghEJGx5x6v9Hiads1gu08USFhFY5A3s2s/BBiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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