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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3af8f5f31bf73eb795271edca24a078ac4b36fffcaca3a30e763899dc6a79fe' 
  AND token = 'YsmS9+TK+WO7vmCm/az20gaJm4Kk/ymfn5TbLMs+5MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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