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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ceedec6fe6f66b56c183e0c85c36571ac3a9558aa315309fcb8b5788a454ed6' 
  AND token = 'A7+zQsQ5KnzWN9jS4dRuiVzy0EmT2aRRWxAkwga/LJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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