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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48edea0ab3fde4d42e7ee194f851f8c4a3d9205aabc103d01d0a2f5613da618e' 
  AND token = 's/SZYgsMcgItkFywA8jwDpjJo9SdrIe4bjZ/iXiFpBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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