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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbd62df7bac44bf37011aea40c89d9a7b4c6720a258568dac31d3641d6c1403' 
  AND token = 'MbnLA+or2ULry4GqTGYGpieDhwZ7KjBAmr8nb8drvnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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