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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4176adca6c1bf5150d62d2e1e0d2ed04a360973b589693fcbe0ac7f527bc99c4' 
  AND token = 'F2BxEwJB9hFdl85LA5md3BTrxMHVGDkvRVxJNxfIRDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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