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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b82a83821a1b1ae2638cc5dc9416a4932064bb563dc7c79e054d69bd80a453c' 
  AND token = 'V5vyorTcI9NuoXeoiV+wdkUE9SIEmowNuB0jfc38laM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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