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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86642b59b3e88d53232a0832acbacb01637602913a63a3f2160433c5aa59d2fc' 
  AND token = 'wATCqKAxjypx7DzZeY7zbiRMcNv8MEcnAgebzticKPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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