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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d35548628e559de65cca41685cb6d7ce64fd4d92ab56a28bce283ea6da7bc6' 
  AND token = 'i3eXwKSSDj0k1DkAj4RksE49MMvGZ/dL1rH1P8VimfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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