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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1392bfd81615dd8274ca84a3120a7872d4745ed3ccb537802322390513739d27' 
  AND token = '3yJYy4VKJfnZJ/vOa9OB4fd8kNOjxCqgeTd56I4D0LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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