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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8821ba585ca5dc24e9c747229e340e6f489bbbc80dff02dc42c06beb2c94c7b1' 
  AND token = 'J9BOvfdvu6tH8Oc0t7ytYPMkNvP8Mvgq3N+6lyL5Q6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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