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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4f0f53fc3c6dc041bc9294400f512e15e1988b09f1142e1976192412ced051' 
  AND token = '/cwI9lJt80aoaep8eeQn6zKionquuKiY3YpQ7UhK4yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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