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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3647d1d179dff8973a31e66aa01d09d7488c1e86488a5bb1b7b4b71a520c983c' 
  AND token = 'gWyQELQNV3Lg4lBMB6ipY7TcnccpQ9Fo+VV4Dw4BjVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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