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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b55808ddf71826f36f17e96934feee8efa530f4a6bb327920b29ab21dd90868' 
  AND token = 'cj4eL39Z8hXxTnELLUQhsOd2EW9ar9gwbvS0JZ1ul0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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