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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e069850064928549cfa2723599af6f340876b6154185795df9e0b3f0898785dc' 
  AND token = '5frgv8J5kfmqfeDioIk6DU2HXndbCg7J7UHSADU5JJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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