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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a72a5f166d77ba680daad8689d0fb465909ea259092c7307a22bcf5b6725b9' 
  AND token = 's2g7eqneV67rinI6vqoEmjRx5zRRxIUctH4AJazmjZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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